leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

parisc: Ensure set_firmware_width() is called only once

Browse Source 
Call set_firmware_width() only once at runtime.
This prevents that hotplugged CPUs will get stuck in spinlocks later on.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2022-03-25 13:10:45 +01:00
parent 7e0b2be94c
commit 1e93848a38
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/parisc/kernel/firmware.c
View File

@ -83,7 +83,7 @@ extern unsigned long pdc_result2[NUM_PDC_RESULT];
/* Firmware needs to be initially set to narrow to determine the
* actual firmware width. */
int parisc_narrow_firmware __ro_after_init = 1;
int parisc_narrow_firmware __ro_after_init = 2;
#endif
/* On most currently-supported platforms, IODC I/O calls are 32-bit calls
@ -174,6 +174,11 @@ void set_firmware_width_unlocked(void)
void set_firmware_width(void)
{
unsigned long flags;
/* already initialized? */
if (parisc_narrow_firmware != 2)
return;
spin_lock_irqsave(&pdc_lock, flags);
set_firmware_width_unlocked();
spin_unlock_irqrestore(&pdc_lock, flags);