vme: Fix a possible sleep-in-atomic bug in vme_tsi148

The driver may sleep under a spinlock.
The function call path is:
tsi148_master_write \ tsi148_master_read (acquire the spinlock)
  vme_register_error_handler
    kmalloc(GFP_KERNEL) --> may sleep

To fix it, GFP_KERNEL is replaced with GFP_ATOMIC.

This bug is found by my static analysis tool(DSAC) and checked by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/vme/vme.c b/drivers/vme/vme.c
index 8124622..92500f6 100644 (file)
--- a/drivers/vme/vme.c
+++ b/drivers/vme/vme.c
@@ -1290,7 +1290,7 @@ struct vme_error_handler *vme_register_error_handler(
 {
        struct vme_error_handler *handler;
 
-       handler = kmalloc(sizeof(*handler), GFP_KERNEL);
+       handler = kmalloc(sizeof(*handler), GFP_ATOMIC);
        if (!handler)
                return NULL;