• Jürg Billeter's avatar
    dmaengine: rcar-dmac: Handle hardware descriptor allocation failure · ee4b876b
    Jürg Billeter authored
    If the atomic DMA coherent pool is too small, disable use of hardware
    descriptor lists instead of crashing the system:
    
    ERROR: 256 KiB atomic DMA coherent pool is too small!
    Please increase it with coherent_pool= kernel parameter!
    
    Unable to handle kernel NULL pointer dereference at virtual address 00000004
    Internal error: Oops: a07 [#1] PREEMPT SMP ARM
    
    PC is at rcar_dmac_chan_reinit+0x3c/0x160
    LR is at _raw_spin_lock_irqsave+0x18/0x5c
    
    [<802132c0>] (rcar_dmac_chan_reinit) from [<80214818>] (rcar_dmac_isr_error+0x84/0xa0)
    [<80214818>] (rcar_dmac_isr_error) from [<80060484>] (handle_irq_event_percpu+0x50/0x150)
    [<80060484>] (handle_irq_event_percpu) from [<800605c0>] (handle_irq_event+0x3c/0x5c)
    [<800605c0>] (handle_irq_event) from [<8006350c>] (handle_fasteoi_irq+0xb8/0x198)
    [<8006350c>] (handle_fasteoi_irq) from [<8005fdb0>] (generic_handle_irq+0x20/0x30)
    [<8005fdb0>] (generic_handle_irq) from [<8000fcd0>] (handle_IRQ+0x50/0xc4)
    [<8000fcd0>] (handle_IRQ) from [<800092cc>] (gic_handle_irq+0x28/0x5c)
    [<800092cc>] (gic_handle_irq) from [<80012700>] (__irq_svc+0x40/0x70)
    
    Kernel panic - not syncing: Fatal exception in interrupt
    Signed-off-by: default avatarJürg Billeter <j@bitron.ch>
    Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
    ee4b876b
rcar-dmac.c 46.1 KB