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Fri, 9 Jun 2023 07:14:06 +0000 (GMT) From: Hari Bathini To: Michael Ellerman Subject: [PATCH v2] powerpc/fadump: invoke ibm,os-term with rtas_call_unlocked() Date: Fri, 9 Jun 2023 12:44:04 +0530 Message-Id: <20230609071404.425529-1-hbathini@linux.ibm.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 8Oq-UVHyL8qiAnK0vPAZQtxY42Uk31vR X-Proofpoint-GUID: 8Oq-UVHyL8qiAnK0vPAZQtxY42Uk31vR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-06-09_04,2023-06-08_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 mlxscore=0 suspectscore=0 clxscore=1015 impostorscore=0 adultscore=0 mlxlogscore=929 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306090062 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev , Mahesh J Salgaonkar , Sourabh Jain Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Invoke ibm,os-term call with rtas_call_unlocked(), without using the RTAS spinlock, to avoid deadlock in the unlikely event of a machine crash while making an RTAS call. Signed-off-by: Hari Bathini Reviewed-by: Mahesh Salgaonkar --- arch/powerpc/kernel/rtas.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index c087eeee320f..a8192e5b1a5f 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -1587,6 +1587,7 @@ static bool ibm_extended_os_term; void rtas_os_term(char *str) { s32 token = rtas_function_token(RTAS_FN_IBM_OS_TERM); + static struct rtas_args args; int status; /* @@ -1607,7 +1608,8 @@ void rtas_os_term(char *str) * schedules. */ do { - status = rtas_call(token, 1, 1, NULL, __pa(rtas_os_term_buf)); + rtas_call_unlocked(&args, token, 1, 1, NULL, __pa(rtas_os_term_buf)); + status = be32_to_cpu(args.rets[0]); } while (rtas_busy_delay_time(status)); if (status != 0)