stir421x_fw_upload() is never called in atomic context.

The call chain ending up at stir421x_fw_upload() is:
[1] stir421x_fw_upload() <- stir421x_patch_device() <- irda_usb_probe()

irda_usb_probe() is set as ".probe" in struct usb_driver.
This function is not called in atomic context.

Despite never getting called from atomic context, stir421x_fw_upload()
calls mdelay() to busily wait.
This is not necessary and can be replaced with usleep_range() to
avoid busy waiting.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.

Signed-off-by: Jia-Ju Bai <>
 drivers/staging/irda/drivers/irda-usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/irda/drivers/irda-usb.c 
index 723e49b..c6c8c2c 100644
--- a/drivers/staging/irda/drivers/irda-usb.c
+++ b/drivers/staging/irda/drivers/irda-usb.c
@@ -1050,7 +1050,7 @@ static int stir421x_fw_upload(struct irda_usb_cb *self,
                if (ret < 0)
-               mdelay(10);
+               usleep_range(10000, 11000);

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