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driver core fixes for 4.13-rc5

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Here are 3 firmware core fixes for 4.13-rc5.
 
 All three of these fix reported issues and have been floating around for
 a few weeks.  They have been in linux-next with no reported problems.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here are three firmware core fixes for 4.13-rc5.

  All three of these fix reported issues and have been floating around
  for a few weeks. They have been in linux-next with no reported
  problems"

* tag 'driver-core-4.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  firmware: avoid invalid fallback aborts by using killable wait
  firmware: fix batched requests - send wake up on failure on direct lookups
  firmware: fix batched requests - wake all waiters
This commit is contained in:
Linus Torvalds 2017-08-13 12:44:18 -07:00
commit c9dc281d91
1 changed files with 34 additions and 15 deletions
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49
drivers/base/firmware_class.c
View File

@ -30,7 +30,6 @@
#include <linux/syscore_ops.h>
#include <linux/reboot.h>
#include <linux/security.h>
#include <linux/swait.h>
#include <generated/utsrelease.h>
@ -112,13 +111,13 @@ static inline long firmware_loading_timeout(void)
* state of the firmware loading.
*/
struct fw_state {
struct swait_queue_head wq;
struct completion completion;
enum fw_status status;
};
static void fw_state_init(struct fw_state *fw_st)
{
init_swait_queue_head(&fw_st->wq);
init_completion(&fw_st->completion);
fw_st->status = FW_STATUS_UNKNOWN;
}
@ -131,9 +130,7 @@ static int __fw_state_wait_common(struct fw_state *fw_st, long timeout)
{
long ret;
ret = swait_event_interruptible_timeout(fw_st->wq,
__fw_state_is_done(READ_ONCE(fw_st->status)),
timeout);
ret = wait_for_completion_killable_timeout(&fw_st->completion, timeout);
if (ret != 0 && fw_st->status == FW_STATUS_ABORTED)
return -ENOENT;
if (!ret)
@ -148,35 +145,34 @@ static void __fw_state_set(struct fw_state *fw_st,
WRITE_ONCE(fw_st->status, status);
if (status == FW_STATUS_DONE || status == FW_STATUS_ABORTED)
swake_up(&fw_st->wq);
complete_all(&fw_st->completion);
}
#define fw_state_start(fw_st) \
__fw_state_set(fw_st, FW_STATUS_LOADING)
#define fw_state_done(fw_st) \
__fw_state_set(fw_st, FW_STATUS_DONE)
#define fw_state_aborted(fw_st) \
__fw_state_set(fw_st, FW_STATUS_ABORTED)
#define fw_state_wait(fw_st) \
__fw_state_wait_common(fw_st, MAX_SCHEDULE_TIMEOUT)
#ifndef CONFIG_FW_LOADER_USER_HELPER
#define fw_state_is_aborted(fw_st) false
#else /* CONFIG_FW_LOADER_USER_HELPER */
static int __fw_state_check(struct fw_state *fw_st, enum fw_status status)
{
return fw_st->status == status;
}
#define fw_state_is_aborted(fw_st) \
__fw_state_check(fw_st, FW_STATUS_ABORTED)
#ifdef CONFIG_FW_LOADER_USER_HELPER
#define fw_state_aborted(fw_st) \
__fw_state_set(fw_st, FW_STATUS_ABORTED)
#define fw_state_is_done(fw_st) \
__fw_state_check(fw_st, FW_STATUS_DONE)
#define fw_state_is_loading(fw_st) \
__fw_state_check(fw_st, FW_STATUS_LOADING)
#define fw_state_is_aborted(fw_st) \
__fw_state_check(fw_st, FW_STATUS_ABORTED)
#define fw_state_wait_timeout(fw_st, timeout) \
__fw_state_wait_common(fw_st, timeout)
@ -1200,6 +1196,28 @@ _request_firmware_prepare(struct firmware **firmware_p, const char *name,
return 1; /* need to load */
}
/*
* Batched requests need only one wake, we need to do this step last due to the
* fallback mechanism. The buf is protected with kref_get(), and it won't be
* released until the last user calls release_firmware().
*
* Failed batched requests are possible as well, in such cases we just share
* the struct firmware_buf and won't release it until all requests are woken
* and have gone through this same path.
*/
static void fw_abort_batch_reqs(struct firmware *fw)
{
struct firmware_buf *buf;
/* Loaded directly? */
if (!fw || !fw->priv)
return;
buf = fw->priv;
if (!fw_state_is_aborted(&buf->fw_st))
fw_state_aborted(&buf->fw_st);
}
/* called from request_firmware() and request_firmware_work_func() */
static int
_request_firmware(const struct firmware **firmware_p, const char *name,
@ -1243,6 +1261,7 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
out:
if (ret < 0) {
fw_abort_batch_reqs(fw);
release_firmware(fw);
fw = NULL;
}