Commit c1d2a313 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman

powerpc/powernv: Fix NVRAM sleep in invalid context when crashing

Similarly to opal_event_shutdown, opal_nvram_write can be called in
the crash path with irqs disabled. Special case the delay to avoid
sleeping in invalid context.

Fixes: 3b807033 ("powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops")
Cc: stable@vger.kernel.org # v3.2
Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 497a0790
......@@ -44,6 +44,10 @@ static ssize_t opal_nvram_read(char *buf, size_t count, loff_t *index)
return count;
}
/*
* This can be called in the panic path with interrupts off, so use
* mdelay in that case.
*/
static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
{
s64 rc = OPAL_BUSY;
......@@ -58,10 +62,16 @@ static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
rc = opal_write_nvram(__pa(buf), count, off);
if (rc == OPAL_BUSY_EVENT) {
msleep(OPAL_BUSY_DELAY_MS);
if (in_interrupt() || irqs_disabled())
mdelay(OPAL_BUSY_DELAY_MS);
else
msleep(OPAL_BUSY_DELAY_MS);
opal_poll_events(NULL);
} else if (rc == OPAL_BUSY) {
msleep(OPAL_BUSY_DELAY_MS);
if (in_interrupt() || irqs_disabled())
mdelay(OPAL_BUSY_DELAY_MS);
else
msleep(OPAL_BUSY_DELAY_MS);
}
}
......
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