lkml.org 
[lkml]   [2020]   [May]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
SubjectPCI: Disable not requested resource types in pci_enable_resources
Date
Currently, if both resource types are enabled before the call, the mask
value doesn't matter. Means as of today I wouldn't be able to e.g.
disable PCI_COMMAND_IO. At least my interpretation is that mask defines
which resource types are enabled after the call. Therefore change the
behavior to disable not requested resource types.

At least on my x86 devices this change doesn't have side effects.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
drivers/pci/setup-res.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index d21fa04fa..6ef458c10 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -459,8 +459,8 @@ int pci_enable_resources(struct pci_dev *dev, int mask)
int i;
struct resource *r;

- pci_read_config_word(dev, PCI_COMMAND, &cmd);
- old_cmd = cmd;
+ pci_read_config_word(dev, PCI_COMMAND, &old_cmd);
+ cmd = old_cmd & ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);

for (i = 0; i < PCI_NUM_RESOURCES; i++) {
if (!(mask & (1 << i)))
--
2.26.2
\
 
 \ /
  Last update: 2020-05-28 20:49    [W:0.041 / U:0.792 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site