[Stable-8.0.5 04/66] checkpatch: add qemu_bh_new/aio_bh_new checks

[Michael Tokarev]

From: Alexander Bulekov <alxndr@bu.edu>

Advise authors to use the _guarded versions of the APIs, instead.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-Id: <20230427211013.2994127-4-alxndr@bu.edu>
Signed-off-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit ef56ffbdd6b0605dc1e305611287b948c970e236)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d768171dcf..eeaec436eb 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2865,6 +2865,14 @@ sub process {
                if ($line =~ /\bsignal\s*\(/ && !($line =~ /SIG_(?:IGN|DFL)/)) {
                        ERROR("use sigaction to establish signal handlers; 
signal is not portable\n" . $herecurr);
                }
+# recommend qemu_bh_new_guarded instead of qemu_bh_new
+        if ($realfile =~ /.*\/hw\/.*/ && $line =~ /\bqemu_bh_new\s*\(/) {
+                       ERROR("use qemu_bh_new_guarded() instead of 
qemu_bh_new() to avoid reentrancy problems\n" . $herecurr);
+               }
+# recommend aio_bh_new_guarded instead of aio_bh_new
+        if ($realfile =~ /.*\/hw\/.*/ && $line =~ /\baio_bh_new\s*\(/) {
+                       ERROR("use aio_bh_new_guarded() instead of aio_bh_new() 
to avoid reentrancy problems\n" . $herecurr);
+               }
 # check for module_init(), use category-specific init macros explicitly please
                if ($line =~ /^module_init\s*\(/) {
                        ERROR("please use block_init(), type_init() etc. 
instead of module_init()\n" . $herecurr);
-- 
2.39.2