Re: [PATCH] [v2] scsi: qedi: fix build error without DEBUG_FS

["Rangankar, Manish" <Manish.Rangankar@cavium.com>]

On 02/03/17 8:28 PM, "Arnd Bergmann" <arnd@arndb.de> wrote:

>Without CONFIG_DEBUG_FS, we run into a link error:
>
>drivers/scsi/qedi/qedi_iscsi.o: In function `qedi_ep_poll':
>qedi_iscsi.c:(.text.qedi_ep_poll+0x134): undefined reference to
>`do_not_recover'
>drivers/scsi/qedi/qedi_iscsi.o: In function `qedi_ep_disconnect':
>qedi_iscsi.c:(.text.qedi_ep_disconnect+0x36c): undefined reference to
>`do_not_recover'
>drivers/scsi/qedi/qedi_iscsi.o: In function `qedi_ep_connect':
>qedi_iscsi.c:(.text.qedi_ep_connect+0x350): undefined reference to
>`do_not_recover'
>drivers/scsi/qedi/qedi_fw.o: In function `qedi_tmf_work':
>qedi_fw.c:(.text.qedi_tmf_work+0x3b4): undefined reference to
>`do_not_recover'
>
>This defines the symbol as a constant in this case, as there is no way to
>set it to anything other than zero without DEBUG_FS. In addition, I'm
>renaming
>it to qedi_do_not_recover in order to put it into a driver specific
>namespace,
>as "do_not_recover" is a really bad name for a kernel-wide global
>identifier
>when it is used only in one driver.
>
>Fixes: ace7f46ba5fd ("scsi: qedi: Add QLogic FastLinQ offload iSCSI
>driver framework.")
>Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
>Signed-off-by: Arnd Bergmann <arnd@arndb.de>
>---
>v2: don't rename references to do_not_recover in string literals
>---
> drivers/scsi/qedi/qedi_debugfs.c | 16 ++++++++--------
> drivers/scsi/qedi/qedi_fw.c      |  4 ++--
> drivers/scsi/qedi/qedi_gbl.h     |  8 +++++++-
> drivers/scsi/qedi/qedi_iscsi.c   |  8 ++++----
> 4 files changed, 21 insertions(+), 15 deletions(-)
>
>diff --git a/drivers/scsi/qedi/qedi_debugfs.c
>b/drivers/scsi/qedi/qedi_debugfs.c
>index 955936274241..59417199bf36 100644
>--- a/drivers/scsi/qedi/qedi_debugfs.c
>+++ b/drivers/scsi/qedi/qedi_debugfs.c
>@@ -14,7 +14,7 @@
> #include <linux/debugfs.h>
> #include <linux/module.h>
> 
>-int do_not_recover;
>+int qedi_do_not_recover;
> static struct dentry *qedi_dbg_root;
> 
> void
>@@ -74,22 +74,22 @@ qedi_dbg_exit(void)
> static ssize_t
> qedi_dbg_do_not_recover_enable(struct qedi_dbg_ctx *qedi_dbg)
> {
>-	if (!do_not_recover)
>-		do_not_recover = 1;
>+	if (!qedi_do_not_recover)
>+		qedi_do_not_recover = 1;
> 
> 	QEDI_INFO(qedi_dbg, QEDI_LOG_DEBUGFS, "do_not_recover=%d\n",
>-		  do_not_recover);
>+		  qedi_do_not_recover);
> 	return 0;
> }
> 
> static ssize_t
> qedi_dbg_do_not_recover_disable(struct qedi_dbg_ctx *qedi_dbg)
> {
>-	if (do_not_recover)
>-		do_not_recover = 0;
>+	if (qedi_do_not_recover)
>+		qedi_do_not_recover = 0;
> 
> 	QEDI_INFO(qedi_dbg, QEDI_LOG_DEBUGFS, "do_not_recover=%d\n",
>-		  do_not_recover);
>+		  qedi_do_not_recover);
> 	return 0;
> }
> 
>@@ -141,7 +141,7 @@ qedi_dbg_do_not_recover_cmd_read(struct file *filp,
>char __user *buffer,
> 	if (*ppos)
> 		return 0;
> 
>-	cnt = sprintf(buffer, "do_not_recover=%d\n", do_not_recover);
>+	cnt = sprintf(buffer, "do_not_recover=%d\n", qedi_do_not_recover);
> 	cnt = min_t(int, count, cnt - *ppos);
> 	*ppos += cnt;
> 	return cnt;
>diff --git a/drivers/scsi/qedi/qedi_fw.c b/drivers/scsi/qedi/qedi_fw.c
>index c9f0ef4e11b3..2bce3efc66a4 100644
>--- a/drivers/scsi/qedi/qedi_fw.c
>+++ b/drivers/scsi/qedi/qedi_fw.c
>@@ -1461,9 +1461,9 @@ static void qedi_tmf_work(struct work_struct *work)
> 		  get_itt(tmf_hdr->rtt), get_itt(ctask->itt), cmd->task_id,
> 		  qedi_conn->iscsi_conn_id);
> 
>-	if (do_not_recover) {
>+	if (qedi_do_not_recover) {
> 		QEDI_ERR(&qedi->dbg_ctx, "DONT SEND CLEANUP/ABORT %d\n",
>-			 do_not_recover);
>+			 qedi_do_not_recover);
> 		goto abort_ret;
> 	}
> 
>diff --git a/drivers/scsi/qedi/qedi_gbl.h b/drivers/scsi/qedi/qedi_gbl.h
>index 8e488de88ece..63d793f46064 100644
>--- a/drivers/scsi/qedi/qedi_gbl.h
>+++ b/drivers/scsi/qedi/qedi_gbl.h
>@@ -12,8 +12,14 @@
> 
> #include "qedi_iscsi.h"
> 
>+#ifdef CONFIG_DEBUG_FS
>+extern int qedi_do_not_recover;
>+#else
>+#define qedi_do_not_recover (0)
>+#endif
>+
> extern uint qedi_io_tracing;
>-extern int do_not_recover;
>+
> extern struct scsi_host_template qedi_host_template;
> extern struct iscsi_transport qedi_iscsi_transport;
> extern const struct qed_iscsi_ops *qedi_ops;
>diff --git a/drivers/scsi/qedi/qedi_iscsi.c
>b/drivers/scsi/qedi/qedi_iscsi.c
>index b9f79d36142d..4cc474364c50 100644
>--- a/drivers/scsi/qedi/qedi_iscsi.c
>+++ b/drivers/scsi/qedi/qedi_iscsi.c
>@@ -833,7 +833,7 @@ qedi_ep_connect(struct Scsi_Host *shost, struct
>sockaddr *dst_addr,
> 		return ERR_PTR(ret);
> 	}
> 
>-	if (do_not_recover) {
>+	if (qedi_do_not_recover) {
> 		ret = -ENOMEM;
> 		return ERR_PTR(ret);
> 	}
>@@ -957,7 +957,7 @@ static int qedi_ep_poll(struct iscsi_endpoint *ep,
>int timeout_ms)
> 	struct qedi_endpoint *qedi_ep;
> 	int ret = 0;
> 
>-	if (do_not_recover)
>+	if (qedi_do_not_recover)
> 		return 1;
> 
> 	qedi_ep = ep->dd_data;
>@@ -1025,7 +1025,7 @@ static void qedi_ep_disconnect(struct
>iscsi_endpoint *ep)
> 		}
> 
> 		if (test_bit(QEDI_IN_RECOVERY, &qedi->flags)) {
>-			if (do_not_recover) {
>+			if (qedi_do_not_recover) {
> 				QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_INFO,
> 					  "Do not recover cid=0x%x\n",
> 					  qedi_ep->iscsi_cid);
>@@ -1039,7 +1039,7 @@ static void qedi_ep_disconnect(struct
>iscsi_endpoint *ep)
> 		}
> 	}
> 
>-	if (do_not_recover)
>+	if (qedi_do_not_recover)
> 		goto ep_exit_recover;
> 
> 	switch (qedi_ep->state) {
>-- 
>2.9.0

Thanks Arnd.

Acked-by: Manish Rangankar <Manish.Rangankar@cavium.com>