[PATCH net] net: ipa: use proper endpoint mask for suspend

[PATCH net] net: ipa: use proper endpoint mask for suspend

[Alex Elder]

It is now possible for a system to have more than 32 endpoints.  As
a result, registers related to endpoint suspend are parameterized,
with 32 endpoints represented in one more registers.

In ipa_interrupt_suspend_control(), the IPA_SUSPEND_EN register
offset is determined properly, but the bit mask used still assumes
the number of enpoints won't exceed 32.  This is a bug.  Fix it.

Fixes: f298ba785e2d ("net: ipa: add a parameter to suspend registers")
Signed-off-by: Alex Elder <elder@linaro.org>
---
 drivers/net/ipa/ipa_interrupt.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c
index a49f66efacb87..d458a35839cce 100644
--- a/drivers/net/ipa/ipa_interrupt.c
+++ b/drivers/net/ipa/ipa_interrupt.c
@@ -132,10 +132,10 @@ static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,
 					  u32 endpoint_id, bool enable)
 {
 	struct ipa *ipa = interrupt->ipa;
+	u32 mask = BIT(endpoint_id % 32);
 	u32 unit = endpoint_id / 32;
 	const struct ipa_reg *reg;
 	u32 offset;
-	u32 mask;
 	u32 val;
 
 	WARN_ON(!test_bit(endpoint_id, ipa->available));
@@ -148,7 +148,6 @@ static void ipa_interrupt_suspend_control(struct ipa_interrupt *interrupt,
 	offset = ipa_reg_n_offset(reg, unit);
 	val = ioread32(ipa->reg_virt + offset);
 
-	mask = BIT(endpoint_id);
 	if (enable)
 		val |= mask;
 	else
-- 
2.34.1

Re: [PATCH net] net: ipa: use proper endpoint mask for suspend

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:

On Fri, 30 Dec 2022 16:33:04 -0600 you wrote:
> It is now possible for a system to have more than 32 endpoints.  As
> a result, registers related to endpoint suspend are parameterized,
> with 32 endpoints represented in one more registers.
> 
> In ipa_interrupt_suspend_control(), the IPA_SUSPEND_EN register
> offset is determined properly, but the bit mask used still assumes
> the number of enpoints won't exceed 32.  This is a bug.  Fix it.
> 
> [...]

Here is the summary with links:
  - [net] net: ipa: use proper endpoint mask for suspend
    https://git.kernel.org/netdev/net/c/d9d71a89f28d

You are awesome, thank you!
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