>-----Original Message----- >From: Jia-Ju Bai [mailto:[email protected]] >Sent: Wednesday, May 31, 2017 8:27 AM >To: [email protected]; [email protected]; >[email protected]; [email protected]; >[email protected] >Cc: [email protected]; [email protected]; linux- >[email protected]; Jia-Ju Bai >Subject: [PATCH] megaraid: Fix a sleep-in-atomic bug > >The driver may sleep under a spin lock, and the function call path is: >mraid_mm_attach_buf (acquire the lock by spin_lock_irqsave) > pci_pool_alloc(GFP_KERNEL) --> may sleep > >To fix it, the "GFP_KERNEL" is replaced with "GFP_ATOMIC". > >Signed-off-by: Jia-Ju Bai <[email protected]> >--- > drivers/scsi/megaraid/megaraid_mm.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > >diff --git a/drivers/scsi/megaraid/megaraid_mm.c >b/drivers/scsi/megaraid/megaraid_mm.c >index 4cf9ed9..c43afb8 100644 >--- a/drivers/scsi/megaraid/megaraid_mm.c >+++ b/drivers/scsi/megaraid/megaraid_mm.c >@@ -574,7 +574,7 @@ > > kioc->pool_index = right_pool; > kioc->free_buf = 1; >- kioc->buf_vaddr = pci_pool_alloc(pool->handle, GFP_KERNEL, >+ kioc->buf_vaddr = pci_pool_alloc(pool->handle, GFP_ATOMIC, > &kioc->buf_paddr); > spin_unlock_irqrestore(&pool->lock, flags);
This is very old driver and reached EOL. Did you face any issue because of this bug or discover this through code review? Anyways patch looks good to me. Acked-by: Sumit Saxena <[email protected]> > >-- >1.7.9.5 >
