kevin/linux
1
Fork 0
Code

firmware: microchip: auto-update: fix poll_complete() to not report spurious timeout errors

Browse Source 
fw_upload's poll_complete() is really intended for use with
asynchronous write() implementations - or at least those where the
write() loop may terminate without the kernel yet being aware of whether
or not the firmware upload has succeeded. For auto-update, write() is
only ever called once and will only return when uploading has completed,
be that by passing or failing. The core fw_upload code only calls
poll_complete() after the final call to write() has returned.

However, the poll_complete() implementation in the auto-update driver
was written to expect poll_complete() to be called from another context,
and it waits for a completion signalled from write(). Since
poll_complete() is actually called from the same context, after the
write() loop has terminated, wait_for_completion() never sees the
completion get signalled and always times out, causing programming to
always report a failing.

Since write() is full synchronous, and its return value will indicate
whether or not programming passed or failed, poll_complete() serves no
purpose and can be cut down to simply return FW_UPLOAD_ERR_NONE.

Cc: stable@vger.kernel.org
Fixes: ec5b0f1193 ("firmware: microchip: add PolarFire SoC Auto Update support")
Reported-by: Jamie Gibbons <jamie.gibbons@microchip.com>
Tested-by: Jamie Gibbons <jamie.gibbons@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
This commit is contained in:
Conor Dooley 2024-10-16 17:35:06 +01:00
parent 8e929cb546
commit 83beece5af
1 changed files with 7 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/firmware/microchip/mpfs-auto-update.c
View File

@ -76,14 +76,11 @@
#define AUTO_UPDATE_INFO_SIZE SZ_1M
#define AUTO_UPDATE_BITSTREAM_BASE (AUTO_UPDATE_DIRECTORY_SIZE + AUTO_UPDATE_INFO_SIZE)
#define AUTO_UPDATE_TIMEOUT_MS 60000
struct mpfs_auto_update_priv {
struct mpfs_sys_controller *sys_controller;
struct device *dev;
struct mtd_info *flash;
struct fw_upload *fw_uploader;
struct completion programming_complete;
size_t size_per_bitstream;
bool cancel_request;
};
@ -156,19 +153,6 @@ static void mpfs_auto_update_cancel(struct fw_upload *fw_uploader)
static enum fw_upload_err mpfs_auto_update_poll_complete(struct fw_upload *fw_uploader)
{
struct mpfs_auto_update_priv *priv = fw_uploader->dd_handle;
int ret;
/*
* There is no meaningful way to get the status of the programming while
* it is in progress, so attempting anything other than waiting for it
* to complete would be misplaced.
*/
ret = wait_for_completion_timeout(&priv->programming_complete,
msecs_to_jiffies(AUTO_UPDATE_TIMEOUT_MS));
if (!ret)
return FW_UPLOAD_ERR_TIMEOUT;
return FW_UPLOAD_ERR_NONE;
}
@ -349,33 +333,23 @@ static enum fw_upload_err mpfs_auto_update_write(struct fw_upload *fw_uploader,
u32 offset, u32 size, u32 *written)
{
struct mpfs_auto_update_priv *priv = fw_uploader->dd_handle;
enum fw_upload_err err = FW_UPLOAD_ERR_NONE;
int ret;
reinit_completion(&priv->programming_complete);
ret = mpfs_auto_update_write_bitstream(fw_uploader, data, offset, size, written);
if (ret) {
err = FW_UPLOAD_ERR_RW_ERROR;
goto out;
}
if (ret)
return FW_UPLOAD_ERR_RW_ERROR;
if (priv->cancel_request) {
err = FW_UPLOAD_ERR_CANCELED;
goto out;
}
if (priv->cancel_request)
return FW_UPLOAD_ERR_CANCELED;
if (mpfs_auto_update_is_bitstream_info(data, size))
goto out;
return FW_UPLOAD_ERR_NONE;
ret = mpfs_auto_update_verify_image(fw_uploader);
if (ret)
err = FW_UPLOAD_ERR_FW_INVALID;
return FW_UPLOAD_ERR_FW_INVALID;
out:
complete(&priv->programming_complete);
return err;
return FW_UPLOAD_ERR_NONE;
}
static const struct fw_upload_ops mpfs_auto_update_ops = {
@ -461,8 +435,6 @@ static int mpfs_auto_update_probe(struct platform_device *pdev)
return dev_err_probe(dev, ret,
"The current bitstream does not support auto-update\n");
init_completion(&priv->programming_complete);
fw_uploader = firmware_upload_register(THIS_MODULE, dev, "mpfs-auto-update",
&mpfs_auto_update_ops, priv);
if (IS_ERR(fw_uploader))