mirror of
https://github.com/torvalds/linux.git
synced 2024-11-01 09:41:44 +00:00
firmware: drop bit ops in favor of simple state machine
We track the state of the firmware loading with bit ops. Since the state machine has only a few states and they are all mutual exclusive there are only a few simple state transition we can model this simplify. UNKNOWN -> LOADING -> DONE | ABORTED Because we don't use any bit ops on fw_state::status anymore we are able to change the data type to enum fw_status and update the function arguments accordingly. READ_ONCE() and WRITE_ONCE() are propably not needed because there are a lot of load and stores around fw_st->status. But let's make it explicit and not be sorry later. Cc: Ming Lei <ming.lei@canonical.com> Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de> Acked-by: Luis R. Rodriguez <mcgrof@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
f52cc37942
commit
0430cafcc4
@ -112,7 +112,7 @@ static inline long firmware_loading_timeout(void)
|
||||
*/
|
||||
struct fw_state {
|
||||
struct completion completion;
|
||||
unsigned long status;
|
||||
enum fw_status status;
|
||||
};
|
||||
|
||||
static void fw_state_init(struct fw_state *fw_st)
|
||||
@ -123,7 +123,7 @@ static void fw_state_init(struct fw_state *fw_st)
|
||||
|
||||
static int __fw_state_check(struct fw_state *fw_st, enum fw_status status)
|
||||
{
|
||||
return test_bit(status, &fw_st->status);
|
||||
return fw_st->status == status;
|
||||
}
|
||||
|
||||
static long __fw_state_wait_common(struct fw_state *fw_st, long timeout)
|
||||
@ -132,7 +132,7 @@ static long __fw_state_wait_common(struct fw_state *fw_st, long timeout)
|
||||
|
||||
ret = wait_for_completion_interruptible_timeout(&fw_st->completion,
|
||||
timeout);
|
||||
if (ret != 0 && test_bit(FW_STATUS_ABORTED, &fw_st->status))
|
||||
if (ret != 0 && READ_ONCE(fw_st->status) == FW_STATUS_ABORTED)
|
||||
return -ENOENT;
|
||||
|
||||
return ret;
|
||||
@ -141,12 +141,10 @@ static long __fw_state_wait_common(struct fw_state *fw_st, long timeout)
|
||||
static void __fw_state_set(struct fw_state *fw_st,
|
||||
enum fw_status status)
|
||||
{
|
||||
set_bit(status, &fw_st->status);
|
||||
WRITE_ONCE(fw_st->status, status);
|
||||
|
||||
if (status == FW_STATUS_DONE || status == FW_STATUS_ABORTED) {
|
||||
clear_bit(FW_STATUS_LOADING, &fw_st->status);
|
||||
if (status == FW_STATUS_DONE || status == FW_STATUS_ABORTED)
|
||||
complete_all(&fw_st->completion);
|
||||
}
|
||||
}
|
||||
|
||||
#define fw_state_start(fw_st) \
|
||||
|
Loading…
Reference in New Issue
Block a user