On Tue, Apr 10, 2018 at 09:04:06PM +0800, Jia-Ju Bai wrote: > pci_epf_test_write() is never called in atomic context. > > The call chain ending up at pci_epf_test_write() is: > [1] pci_epf_test_write() <- pci_epf_test_cmd_handler() > > pci_epf_test_cmd_handler() is set as a parameter of INIT_DELAYED_WORK() > in pci_epf_test_probe(). > This function is not called in atomic context. > > Despite never getting called from atomic context, pci_epf_test_write() > 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 <baijiaju1990@xxxxxxxxx> > --- > drivers/pci/endpoint/functions/pci-epf-test.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) I'd request Kishon's ACK on this. Thanks, Lorenzo > diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c > index f9308c2..2f0642e 100644 > --- a/drivers/pci/endpoint/functions/pci-epf-test.c > +++ b/drivers/pci/endpoint/functions/pci-epf-test.c > @@ -237,7 +237,7 @@ static int pci_epf_test_write(struct pci_epf_test *epf_test) > * wait 1ms inorder for the write to complete. Without this delay L3 > * error in observed in the host system. > */ > - mdelay(1); > + usleep_range(1000, 2000); > > kfree(buf); > > -- > 1.9.1 >
