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thunderbolt: Fix for v5.9-rc6

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One more fix that makes ASUS PA27AC Thunderbolt 3 monitor work more
 reliably.
 
 This has been in linux-next with no reported issues.
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Merge tag 'thunderbolt-for-v5.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-linus

Mika writes:

thunderbolt: Fix for v5.9-rc6

One more fix that makes ASUS PA27AC Thunderbolt 3 monitor work more
reliably.

This has been in linux-next with no reported issues.

* tag 'thunderbolt-for-v5.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt:
  thunderbolt: Retry DROM read once if parsing fails
This commit is contained in:
Greg Kroah-Hartman 2020-09-15 13:52:14 +02:00
commit bf638d736e
1 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/thunderbolt/eeprom.c
View File

@ -7,6 +7,7 @@
*/
#include <linux/crc32.h>
#include <linux/delay.h>
#include <linux/property.h>
#include <linux/slab.h>
#include "tb.h"
@ -389,8 +390,8 @@ static int tb_drom_parse_entries(struct tb_switch *sw)
struct tb_drom_entry_header *entry = (void *) (sw->drom + pos);
if (pos + 1 == drom_size || pos + entry->len > drom_size
|| !entry->len) {
tb_sw_warn(sw, "drom buffer overrun, aborting\n");
return -EIO;
tb_sw_warn(sw, "DROM buffer overrun\n");
return -EILSEQ;
}
switch (entry->type) {
@ -526,7 +527,8 @@ int tb_drom_read(struct tb_switch *sw)
u16 size;
u32 crc;
struct tb_drom_header *header;
int res;
int res, retries = 1;
if (sw->drom)
return 0;
@ -612,7 +614,17 @@ int tb_drom_read(struct tb_switch *sw)
tb_sw_warn(sw, "drom device_rom_revision %#x unknown\n",
header->device_rom_revision);
return tb_drom_parse_entries(sw);
res = tb_drom_parse_entries(sw);
/* If the DROM parsing fails, wait a moment and retry once */
if (res == -EILSEQ && retries--) {
tb_sw_warn(sw, "parsing DROM failed, retrying\n");
msleep(100);
res = tb_drom_read_n(sw, 0, sw->drom, size);
if (!res)
goto parse;
}
return res;
err:
kfree(sw->drom);
sw->drom = NULL;