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bus: mhi: core: Remove link_status() callback

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If the MHI core detects invalid data due to a PCI read, it calls into
the controller via link_status() to double check that the link is infact
down.  All in all, this is pretty pointless, and racy.  There are no good
reasons for this, and only drawbacks.

Its pointless because chances are, the controller is going to do the same
thing to determine if the link is down - attempt a PCI access and compare
the result.  This does not make the link status decision any smarter.

Its racy because its possible that the link was down at the time of the
MHI core access, but then recovered before the controller access.  In this
case, the controller will indicate the link is not down, and the MHI core
will precede to use a bad value as the MHI core does not attempt to retry
the access.

Retrying the access in the MHI core is a bad idea because again, it is
racy - what if the link is down again?  Furthermore, there may be some
higher level state associated with the link status, that is now invalid
because the link went down.

The only reason why the MHI core could see "invalid" data when doing a PCI
access, that is actually valid, is if the register actually contained the
PCI spec defined sentinel for an invalid access.  In this case, it is
arguable that the MHI implementation broken, and should be fixed, not
worked around.

Therefore, remove the link_status() callback before anyone attempts to
implement it.

Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200430190555.32741-4-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeffrey Hugo 2020-05-01 00:35:52 +05:30 committed by Greg Kroah-Hartman
parent ce31225808
commit 85a087df4a
3 changed files with 4 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/bus/mhi/core/init.c
View File

@ -812,10 +812,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
if (!mhi_cntrl)
return -EINVAL;
if (!mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put)
return -EINVAL;
if (!mhi_cntrl->status_cb || !mhi_cntrl->link_status)
if (!mhi_cntrl->runtime_get || !mhi_cntrl->runtime_put ||
!mhi_cntrl->status_cb)
return -EINVAL;
ret = parse_config(mhi_cntrl, config);

5
drivers/bus/mhi/core/main.c
View File

@ -20,9 +20,8 @@ int __must_check mhi_read_reg(struct mhi_controller *mhi_cntrl,
{
u32 tmp = readl(base + offset);
/* If there is any unexpected value, query the link status */
if (PCI_INVALID_READ(tmp) &&
mhi_cntrl->link_status(mhi_cntrl))
/* If the value is invalid, the link is down */
if (PCI_INVALID_READ(tmp))
return -EIO;
*out = tmp;

2
include/linux/mhi.h
View File

@ -335,7 +335,6 @@ struct mhi_controller_config {
* @syserr_worker: System error worker
* @state_event: State change event
* @status_cb: CB function to notify power states of the device (required)
* @link_status: CB function to query link status of the device (required)
* @wake_get: CB function to assert device wake (optional)
* @wake_put: CB function to de-assert device wake (optional)
* @wake_toggle: CB function to assert and de-assert device wake (optional)
@ -417,7 +416,6 @@ struct mhi_controller {
void (*status_cb)(struct mhi_controller *mhi_cntrl,
enum mhi_callback cb);
int (*link_status)(struct mhi_controller *mhi_cntrl);
void (*wake_get)(struct mhi_controller *mhi_cntrl, bool override);
void (*wake_put)(struct mhi_controller *mhi_cntrl, bool override);
void (*wake_toggle)(struct mhi_controller *mhi_cntrl);