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util/nvmutil: limit EAGAIN/EINTR retries

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set it really high though, so it's still
basically reliably

an EINTR/EAGAIN storm could cause problems
in prw()

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-18 04:44:36 +00:00
parent 3f2a6e749f
commit 8d467ecea9
2 changed files with 13 additions and 2 deletions
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11
util/nvmutil/nvmutil.c
View File

@@ -2261,6 +2261,12 @@ prw(int fd, void *mem, unsigned long nrw,
int loop_eagain, int loop_eintr,
int off_reset)
{
#ifndef MAX_EAGAIN_RETRIES
unsigned long retries = 100000;
#else
unsigned long retries = MAX_EAGAIN_RETRIES;
#endif
long r;
int positional_rw;
struct stat st;
@@ -2388,8 +2394,9 @@ real_pread_pwrite:
}
} while (r == -1 &&
(errno == try_err(loop_eintr, EINTR)
|| errno == try_err(loop_eagain, EAGAIN)));
(errno == try_err(loop_eintr, EINTR) ||
errno == try_err(loop_eagain, EAGAIN)) &&
retries++ < MAX_EAGAIN_RETRIES);
}
saved_errno = errno;

4
util/nvmutil/nvmutil.h
View File

@@ -36,6 +36,10 @@ int fchmod(int fd, mode_t mode);
#define HAVE_REAL_PREAD_PWRITE 0
#endif
#ifndef MAX_EAGAIN_RETRIES
#define MAX_EAGAIN_RETRIES 100000
#endif
#ifndef LOOP_EAGAIN
#define LOOP_EAGAIN 1
#endif