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Commit bcee5ba0 authored by Matthew Dharm's avatar Matthew Dharm Committed by Greg Kroah-Hartman
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[PATCH] USB storage: add error checks, remove useless code 

This patch removes attempts to clear halts on a control endpoint (think
about it for a minute if you don't see why this is pointless....) and also
adds return-code checks for all places where halts are cleared.

This _should_ be just redundant code, but recent tests suggest that this
is, in fact, not the case.  People should _heavily_ test this patch.  I'm
going to pause here for a while (in the patch stream) until we've got this
sorted out -- initial results on my test setup seem to show some problems
still remain.  Where those problems are (HCD or usb-storage) remains to be
seen.
parent b2bc6be6
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Showing with 27 additions and 63 deletions
drivers/usb/storage/isd200.c
View file @ bcee5ba0
......@@ -425,7 +425,8 @@ static int isd200_transfer_partial( struct us_data *us,
/* if we stall, we need to clear it before we go on */
if (result == -EPIPE) {
US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
usb_stor_clear_halt(us, pipe);
if (usb_stor_clear_halt(us, pipe) < 0)
return ISD200_TRANSPORT_FAILED;
}
/* did we send all the data? */
......@@ -589,7 +590,8 @@ int isd200_Bulk_transport( struct us_data *us, Scsi_Cmnd *srb,
else if (result == -EPIPE) {
/* if we stall, we need to clear it before we go on */
US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
usb_stor_clear_halt(us, pipe);
if (usb_stor_clear_halt(us, pipe) < 0)
return ISD200_TRANSPORT_ERROR;
} else if (result)
return ISD200_TRANSPORT_ERROR;
......@@ -621,7 +623,8 @@ int isd200_Bulk_transport( struct us_data *us, Scsi_Cmnd *srb,
/* did the attempt to read the CSW fail? */
if (result == -EPIPE) {
US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
usb_stor_clear_halt(us, pipe);
if (usb_stor_clear_halt(us, pipe) < 0)
return ISD200_TRANSPORT_ERROR;
/* get the status again */
US_DEBUGP("Attempting to get CSW (2nd try)...\n");
......@@ -946,15 +949,6 @@ int isd200_write_config( struct us_data *us )
US_DEBUGP(" ISD200 Config Data was written successfully\n");
} else {
US_DEBUGP(" Request to write ISD200 Config Data failed!\n");
/* STALL must be cleared when they are detected */
if (result == -EPIPE) {
US_DEBUGP("-- Stall on control pipe. Clearing\n");
result = usb_stor_clear_halt(us,
usb_sndctrlpipe(us->pusb_dev, 0));
US_DEBUGP("-- usb_stor_clear_halt() returns %d\n", result);
}
retStatus = ISD200_ERROR;
}
......@@ -1000,15 +994,6 @@ int isd200_read_config( struct us_data *us )
#endif
} else {
US_DEBUGP(" Request to get ISD200 Config Data failed!\n");
/* STALL must be cleared when they are detected */
if (result == -EPIPE) {
US_DEBUGP("-- Stall on control pipe. Clearing\n");
result = usb_stor_clear_halt(us,
usb_sndctrlpipe(us->pusb_dev, 0));
US_DEBUGP("-- usb_stor_clear_halt() returns %d\n", result);
}
retStatus = ISD200_ERROR;
}
......
drivers/usb/storage/raw_bulk.c
View file @ bcee5ba0
......@@ -67,12 +67,9 @@ usb_storage_send_control(struct us_data *us,
// Check the return code for the command.
if (result < 0) {
/* a stall is a fatal condition from the device */
/* a stall indicates a protocol error */
if (result == -EPIPE) {
US_DEBUGP("-- Stall on control pipe. Clearing\n");
result = usb_stor_clear_halt(us, pipe);
US_DEBUGP("-- usb_stor_clear_halt() returns %d\n",
result);
US_DEBUGP("-- Stall on control pipe\n");
return USB_STOR_TRANSPORT_FAILED;
}
......@@ -102,7 +99,8 @@ usb_storage_raw_bulk(struct us_data *us, int direction, unsigned char *data,
US_DEBUGP("EPIPE: clearing endpoint halt for"
" pipe 0x%x, stalled at %d bytes\n",
pipe, *act_len);
usb_stor_clear_halt(us, pipe);
if (usb_stor_clear_halt(us, pipe) < 0)
return US_BULK_TRANSFER_FAILED;
/* return US_BULK_TRANSFER_SHORT; */
}
......
drivers/usb/storage/shuttle_usbat.c
View file @ bcee5ba0
......@@ -348,10 +348,13 @@ int usbat_rw_block_test(struct us_data *us,
* the bulk output pipe only the first time.
*/
if (direction==SCSI_DATA_READ && i==0)
usb_stor_clear_halt(us,
if (direction==SCSI_DATA_READ && i==0) {
if (usb_stor_clear_halt(us,
usb_sndbulkpipe(us->pusb_dev,
us->ep_out));
us->ep_out)) < 0)
return USB_STOR_TRANSPORT_ERROR;
}
/*
* Read status: is the device angry, or just busy?
*/
......
drivers/usb/storage/transport.c
View file @ bcee5ba0
......@@ -571,7 +571,8 @@ int usb_stor_transfer_partial(struct us_data *us, char *buf, int length)
/* if we stall, we need to clear it before we go on */
if (result == -EPIPE) {
US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
usb_stor_clear_halt(us, pipe);
if (usb_stor_clear_halt(us, pipe) < 0)
return US_BULK_TRANSFER_FAILED;
}
/* did we abort this command? */
......@@ -997,18 +998,9 @@ int usb_stor_CBI_transport(Scsi_Cmnd *srb, struct us_data *us)
return US_BULK_TRANSFER_ABORTED;
}
/* STALL must be cleared when it is detected */
/* a stall indicates a protocol error */
if (result == -EPIPE) {
US_DEBUGP("-- Stall on control pipe. Clearing\n");
result = usb_stor_clear_halt(us,
usb_sndctrlpipe(us->pusb_dev, 0));
/* did we abort this command? */
if (atomic_read(&us->sm_state) == US_STATE_ABORTING) {
US_DEBUGP("usb_stor_control_msg(): transfer aborted\n");
return US_BULK_TRANSFER_ABORTED;
}
US_DEBUGP("-- Stall on control pipe\n");
return USB_STOR_TRANSPORT_FAILED;
}
......@@ -1114,17 +1106,9 @@ int usb_stor_CB_transport(Scsi_Cmnd *srb, struct us_data *us)
return US_BULK_TRANSFER_ABORTED;
}
/* a stall is a fatal condition from the device */
/* a stall indicates a protocol error */
if (result == -EPIPE) {
US_DEBUGP("-- Stall on control pipe. Clearing\n");
result = usb_stor_clear_halt(us,
usb_sndctrlpipe(us->pusb_dev, 0));
/* did we abort this command? */
if (atomic_read(&us->sm_state) == US_STATE_ABORTING) {
US_DEBUGP("usb_stor_CB_transport(): transfer aborted\n");
return US_BULK_TRANSFER_ABORTED;
}
US_DEBUGP("-- Stall on control pipe\n");
return USB_STOR_TRANSPORT_FAILED;
}
......@@ -1182,15 +1166,6 @@ int usb_stor_Bulk_max_lun(struct us_data *us)
if (result == 1)
return data;
/* if we get a STALL, clear the stall */
if (result == -EPIPE) {
US_DEBUGP("clearing endpoint halt for pipe 0x%x\n", pipe);
/* Use usb_clear_halt() because this is not a
* scsi queued-command */
usb_clear_halt(us->pusb_dev, pipe);
}
/* return the default -- no LUNs */
return 0;
}
......@@ -1245,6 +1220,8 @@ int usb_stor_Bulk_transport(Scsi_Cmnd *srb, struct us_data *us)
US_DEBUGP("usb_stor_Bulk_transport(): transfer aborted\n");
return US_BULK_TRANSFER_ABORTED;
}
if (result < 0)
return USB_STOR_TRANSPORT_ERROR;
result = -EPIPE;
} else if (result) {
/* unknown error -- we've got a problem */
......@@ -1293,6 +1270,8 @@ int usb_stor_Bulk_transport(Scsi_Cmnd *srb, struct us_data *us)
US_DEBUGP("usb_stor_Bulk_transport(): transfer aborted\n");
return US_BULK_TRANSFER_ABORTED;
}
if (result < 0)
return USB_STOR_TRANSPORT_ERROR;
/* get the status again */
US_DEBUGP("Attempting to get CSW (2nd try)...\n");
......
drivers/usb/storage/usb.c
View file @ bcee5ba0
......@@ -724,8 +724,7 @@ static void * storage_probe(struct usb_device *dev, unsigned int ifnum,
US_DEBUGP("Result from usb_set_configuration is %d\n", result);
if (result == -EPIPE) {
US_DEBUGP("-- clearing stall on control interface\n");
usb_clear_halt(dev, usb_sndctrlpipe(dev, 0));
US_DEBUGP("-- stall on control interface\n");
} else if (result != 0) {
/* it's not a stall, but another error -- time to bail */
US_DEBUGP("-- Unknown error. Rejecting device\n");
......
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