scsi: aacraid: Prevent crash in case of free interrupt during scsi EH path

As part of the scsi EH path, aacraid performs a reinitialization of the
adapter, which encompass freeing resources and IRQs, NULLifying lots of
pointers, and then initialize it all over again.  We've identified a
problem during the free IRQ portion of this path if CONFIG_DEBUG_SHIRQ
is enabled on kernel config file.

Happens that, in case this flag was set, right after free_irq()
effectively clears the interrupt, it checks if it was requested as
IRQF_SHARED. In positive case, it performs another call to the IRQ
handler on driver. Problem is: since aacraid currently free some
resources *before* freeing the IRQ, once free_irq() path calls the
handler again (due to CONFIG_DEBUG_SHIRQ), aacraid crashes due to NULL
pointer dereference with the following trace:

  aac_src_intr_message+0xf8/0x740 [aacraid]
  __free_irq+0x33c/0x4a0
  free_irq+0x78/0xb0
  aac_free_irq+0x13c/0x150 [aacraid]
  aac_reset_adapter+0x2e8/0x970 [aacraid]
  aac_eh_reset+0x3a8/0x5d0 [aacraid]
  scsi_try_host_reset+0x74/0x180
  scsi_eh_ready_devs+0xc70/0x1510
  scsi_error_handler+0x624/0xa20

This patch prevents the crash by changing the order of the
deinitialization in this path of aacraid: first we clear the IRQ, then
we free other resources. No functional change intended.

Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Reviewed-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index 2abe8fd834941413d717260ec0a0c160d4b7ced5..bec9f3193f607c0aa1ca5f728f5eac85de518d61 100644 (file)
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -1554,6 +1554,7 @@ static int _aac_reset_adapter(struct aac_dev *aac, int forced, u8 reset_type)
         * will ensure that i/o is queisced and the card is flushed in that
         * case.
         */
+       aac_free_irq(aac);
        aac_fib_map_free(aac);
        dma_free_coherent(&aac->pdev->dev, aac->comm_size, aac->comm_addr,
                          aac->comm_phys);
@@ -1561,7 +1562,6 @@ static int _aac_reset_adapter(struct aac_dev *aac, int forced, u8 reset_type)
        aac->comm_phys = 0;
        kfree(aac->queues);
        aac->queues = NULL;
-       aac_free_irq(aac);
        kfree(aac->fsa_dev);
        aac->fsa_dev = NULL;