Hi, Bjorn,
On Wed, Jun 26, 2024 at 11:08 PM Bjorn Helgaas helgaas@kernel.org wrote:
On Sun, Jun 23, 2024 at 11:39:40AM +0800, Huacai Chen wrote:
Don't limit MRRS during resume, so that saved value can be restored, otherwise the MRRS will become the minimum value after resume.
Cc: stable@vger.kernel.org Fixes: 8b3517f88ff2983f ("PCI: loongson: Prevent LS7A MRRS increases") Signed-off-by: Jianmin Lv lvjianmin@loongson.cn Signed-off-by: Huacai Chen chenhuacai@loongson.cn
drivers/pci/pci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 35fb1f17a589..bfc806d9e9bd 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -31,6 +31,7 @@ #include <asm/dma.h> #include <linux/aer.h> #include <linux/bitfield.h> +#include <linux/suspend.h> #include "pci.h"
DEFINE_MUTEX(pci_slot_mutex); @@ -5945,7 +5946,7 @@ int pcie_set_readrq(struct pci_dev *dev, int rq)
v = FIELD_PREP(PCI_EXP_DEVCTL_READRQ, ffs(rq) - 8);
if (bridge->no_inc_mrrs) {
if (bridge->no_inc_mrrs && (pm_suspend_target_state == PM_SUSPEND_ON)) {I don't think we can check pm_suspend_target_state here. That seems like a layering/encapsulation problem. Are we failing to save this state at suspend? Seems like something we should address more explicitly higher up in the suspend/resume path where we save/restore config space.
I'm sorry, after some deep analysis, we found this patch is unnecessary, please ignore this.
Huacai
int max_mrrs = pcie_get_readrq(dev); if (rq > max_mrrs) {-- 2.43.0