Calling memory allocation function from the context of interrupt:
request_irq(mhba->pdev->irq, mvumi_isr_handler, IRQF_SHARED, "mvumi", mhba);
Function mvumi_isr_handler() calls mvumi_handshake(mhba) that calls
mvumi_init_data(mhba). In mvumi_init_data() there is function
mvumi_alloc_mem_resource(mhba,..) that calls kzalloc(sizeof(*res), GFP_KERNEL).
In the case of GFP_KERNEL flag, function execution can be preempted,
because a greater number of operations to find and allocate memory
blocks is executed.
The patch change GFP_KERNEL flag to GFP_ATOMIC.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Vladimir Gratinskiy <gratins...@ispras.ru>
---
drivers/scsi/mvumi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/mvumi.c b/drivers/scsi/mvumi.c
index 88cf1db..097f72f 100644
--- a/drivers/scsi/mvumi.c
+++ b/drivers/scsi/mvumi.c
@@ -118,7 +118,7 @@ static int mvumi_map_pci_addr(struct pci_dev *dev, void
**addr_array)
static struct mvumi_res *mvumi_alloc_mem_resource(struct mvumi_hba *mhba,
enum resource_type type, unsigned int size)
{
- struct mvumi_res *res = kzalloc(sizeof(*res), GFP_KERNEL);
+ struct mvumi_res *res = kzalloc(sizeof(*res), GFP_ATOMIC);
if (!res) {
dev_err(&mhba->pdev->dev,
@@ -128,7 +128,7 @@ static struct mvumi_res *mvumi_alloc_mem_resource(struct
mvumi_hba *mhba,
switch (type) {
case RESOURCE_CACHED_MEMORY:
- res->virt_addr = kzalloc(size, GFP_KERNEL);
+ res->virt_addr = kzalloc(size, GFP_ATOMIC);
if (!res->virt_addr) {
dev_err(&mhba->pdev->dev,
"unable to allocate memory,size = %d.\n", size);
--
1.7.9.5
--
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