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From: Romain Perier <romain.perier@gmail.com>
To: kernel-hardening@lists.openwall.com
Cc: Kees Cook <keescook@chromium.org>,
	Romain Perier <romain.perier@gmail.com>
Subject: [PRE-REVIEW PATCH 09/16] scsi: pm8001: Prepare to use the new tasklet API
Date: Sun, 29 Sep 2019 18:30:21 +0200
Message-ID: <20190929163028.9665-10-romain.perier@gmail.com> (raw)
In-Reply-To: <20190929163028.9665-1-romain.perier@gmail.com>

The future tasklet API will no longer allow to pass an arbitrary
"unsigned long" data parameter. The tasklet data structure will need to
be embedded into a data structure that will be retrieved from the tasklet
handler. Currently, there are no ways from the tasklet of the handler to
retrieve the parent data structure by using container_of(), mainly
because we cannot know the index of the tasklet in the array of tasklets.
This commits adds a intermediate data structure, that stores "irq_id",
that is the index of the irq_vector and of the tasklet, so
based on this index we will be able to use container_of() and retrieve
the root parent structure.

Signed-off-by: Romain Perier <romain.perier@gmail.com>
---
 drivers/scsi/pm8001/pm8001_init.c | 42 +++++++++++++++++++------------
 drivers/scsi/pm8001/pm8001_sas.h  |  6 ++++-
 2 files changed, 31 insertions(+), 17 deletions(-)

diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
index 3374f553c617..f508e8314188 100644
--- a/drivers/scsi/pm8001/pm8001_init.c
+++ b/drivers/scsi/pm8001/pm8001_init.c
@@ -204,7 +204,7 @@ static irqreturn_t pm8001_interrupt_handler_msix(int irq, void *opaque)
 	if (!PM8001_CHIP_DISP->is_our_interrupt(pm8001_ha))
 		return IRQ_NONE;
 #ifdef PM8001_USE_TASKLET
-	tasklet_schedule(&pm8001_ha->tasklet[irq_vector->irq_id]);
+	tasklet_schedule(&pm8001_ha->tasklet[irq_vector->irq_id].tasklet);
 #else
 	ret = PM8001_CHIP_DISP->isr(pm8001_ha, irq_vector->irq_id);
 #endif
@@ -228,7 +228,7 @@ static irqreturn_t pm8001_interrupt_handler_intx(int irq, void *dev_id)
 		return IRQ_NONE;
 
 #ifdef PM8001_USE_TASKLET
-	tasklet_schedule(&pm8001_ha->tasklet[0]);
+	tasklet_schedule(&pm8001_ha->tasklet[0].tasklet);
 #else
 	ret = PM8001_CHIP_DISP->isr(pm8001_ha, 0);
 #endif
@@ -477,13 +477,18 @@ static struct pm8001_hba_info *pm8001_pci_alloc(struct pci_dev *pdev,
 #ifdef PM8001_USE_TASKLET
 	/* Tasklet for non msi-x interrupt handler */
 	if ((!pdev->msix_cap || !pci_msi_enabled())
-	    || (pm8001_ha->chip_id == chip_8001))
-		tasklet_init(&pm8001_ha->tasklet[0], pm8001_tasklet,
+	    || (pm8001_ha->chip_id == chip_8001)) {
+		pm8001_ha->tasklet[0].irq_id = 0;
+		tasklet_init(&pm8001_ha->tasklet[0].tasklet, pm8001_tasklet,
 			(unsigned long)&(pm8001_ha->irq_vector[0]));
-	else
-		for (j = 0; j < PM8001_MAX_MSIX_VEC; j++)
-			tasklet_init(&pm8001_ha->tasklet[j], pm8001_tasklet,
+	} else {
+		for (j = 0; j < PM8001_MAX_MSIX_VEC; j++) {
+			pm8001_ha->tasklet[j].irq_id = j;
+			tasklet_init(&pm8001_ha->tasklet[j].tasklet,
+				pm8001_tasklet,
 				(unsigned long)&(pm8001_ha->irq_vector[j]));
+		}
+	}
 #endif
 	pm8001_ioremap(pm8001_ha);
 	if (!pm8001_alloc(pm8001_ha, ent))
@@ -1092,10 +1097,10 @@ static void pm8001_pci_remove(struct pci_dev *pdev)
 	/* For non-msix and msix interrupts */
 	if ((!pdev->msix_cap || !pci_msi_enabled()) ||
 	    (pm8001_ha->chip_id == chip_8001))
-		tasklet_kill(&pm8001_ha->tasklet[0]);
+		tasklet_kill(&pm8001_ha->tasklet[0].tasklet);
 	else
 		for (j = 0; j < PM8001_MAX_MSIX_VEC; j++)
-			tasklet_kill(&pm8001_ha->tasklet[j]);
+			tasklet_kill(&pm8001_ha->tasklet[j].tasklet);
 #endif
 	scsi_host_put(pm8001_ha->shost);
 	pm8001_free(pm8001_ha);
@@ -1142,10 +1147,10 @@ static int pm8001_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 	/* For non-msix and msix interrupts */
 	if ((!pdev->msix_cap || !pci_msi_enabled()) ||
 	    (pm8001_ha->chip_id == chip_8001))
-		tasklet_kill(&pm8001_ha->tasklet[0]);
+		tasklet_kill(&pm8001_ha->tasklet[0].tasklet);
 	else
 		for (j = 0; j < PM8001_MAX_MSIX_VEC; j++)
-			tasklet_kill(&pm8001_ha->tasklet[j]);
+			tasklet_kill(&pm8001_ha->tasklet[j].tasklet);
 #endif
 	device_state = pci_choose_state(pdev, state);
 	pm8001_printk("pdev=0x%p, slot=%s, entering "
@@ -1211,13 +1216,18 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
 #ifdef PM8001_USE_TASKLET
 	/*  Tasklet for non msi-x interrupt handler */
 	if ((!pdev->msix_cap || !pci_msi_enabled()) ||
-	    (pm8001_ha->chip_id == chip_8001))
-		tasklet_init(&pm8001_ha->tasklet[0], pm8001_tasklet,
+	    (pm8001_ha->chip_id == chip_8001)) {
+		pm8001_ha->tasklet[0].irq_id = 0;
+		tasklet_init(&pm8001_ha->tasklet[0].tasklet, pm8001_tasklet,
 			(unsigned long)&(pm8001_ha->irq_vector[0]));
-	else
-		for (j = 0; j < PM8001_MAX_MSIX_VEC; j++)
-			tasklet_init(&pm8001_ha->tasklet[j], pm8001_tasklet,
+	} else {
+		for (j = 0; j < PM8001_MAX_MSIX_VEC; j++) {
+			pm8001_ha->tasklet[j].irq_id = j;
+			tasklet_init(&pm8001_ha->tasklet[j].tasklet,
+				pm8001_tasklet,
 				(unsigned long)&(pm8001_ha->irq_vector[j]));
+		}
+	}
 #endif
 	PM8001_CHIP_DISP->interrupt_enable(pm8001_ha, 0);
 	if (pm8001_ha->chip_id != chip_8001) {
diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h
index ff17c6aff63d..0199c64f6cc3 100644
--- a/drivers/scsi/pm8001/pm8001_sas.h
+++ b/drivers/scsi/pm8001/pm8001_sas.h
@@ -480,6 +480,10 @@ struct isr_param {
 	struct pm8001_hba_info *drv_inst;
 	u32 irq_id;
 };
+struct tsk_param {
+	struct tasklet_struct tasklet;
+	u32 irq_id;
+};
 struct pm8001_hba_info {
 	char			name[PM8001_NAME_LENGTH];
 	struct list_head	list;
@@ -532,7 +536,7 @@ struct pm8001_hba_info {
 	int			number_of_intr;/*will be used in remove()*/
 #endif
 #ifdef PM8001_USE_TASKLET
-	struct tasklet_struct	tasklet[PM8001_MAX_MSIX_VEC];
+	struct tsk_param	tasklet[PM8001_MAX_MSIX_VEC];
 #endif
 	u32			logging_level;
 	u32			fw_status;
-- 
2.23.0


  parent reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-29 16:30 [PRE-REVIEW PATCH 00/16] Modernize the " Romain Perier
2019-09-29 16:30 ` [PRE-REVIEW PATCH 01/16] tasklet: Prepare to change tasklet callback argument type Romain Perier
2019-09-29 16:30 ` [PRE-REVIEW PATCH 02/16] crypto: ccp - Prepare to use the new tasklet API Romain Perier
2019-09-30 22:35   ` Kees Cook
2019-09-29 16:30 ` [PRE-REVIEW PATCH 03/16] mmc: renesas_sdhi: " Romain Perier
2019-09-29 16:30 ` [PRE-REVIEW PATCH 04/16] net: liquidio: " Romain Perier
2019-09-29 16:30 ` [PRE-REVIEW PATCH 05/16] chelsio: " Romain Perier
2019-09-29 16:30 ` [PRE-REVIEW PATCH 06/16] net: mvpp2: " Romain Perier
2019-09-29 16:30 ` [PRE-REVIEW PATCH 07/16] qed: " Romain Perier
2019-09-29 16:30 ` [PRE-REVIEW PATCH 08/16] isdn: " Romain Perier
2019-09-29 16:30 ` Romain Perier [this message]
2019-09-29 16:30 ` [PRE-REVIEW PATCH 10/16] scsi: pmcraid: " Romain Perier
2019-09-29 16:30 ` [PRE-REVIEW PATCH 11/16] treewide: Globally replace tasklet_init() by tasklet_setup() Romain Perier
2019-09-30 22:46   ` Kees Cook
2019-10-01 17:18     ` Romain Perier
2019-10-10 22:30       ` Kees Cook
2019-09-29 16:30 ` [PRE-REVIEW PATCH 12/16] tasklet: Pass tasklet_struct pointer as .data in DECLARE_TASKLET Romain Perier
2019-09-30 22:44   ` Kees Cook
2019-09-29 16:30 ` [PRE-REVIEW PATCH 13/16] tasklet: Pass tasklet_struct pointer to callbacks unconditionally Romain Perier
2019-09-30 22:49   ` Kees Cook
2019-09-29 16:30 ` [PRE-REVIEW PATCH 14/16] tasklet: Remove the data argument from DECLARE_TASKLET() macros Romain Perier
2019-09-30 22:50   ` Kees Cook
2019-09-29 16:30 ` [PRE-REVIEW PATCH 15/16] tasklet: convert callbacks prototype for using struct tasklet_struct * arguments Romain Perier
2019-09-29 16:30 ` [PRE-REVIEW PATCH 16/16] tasklet: Add the new initialization function permanently Romain Perier
2019-09-30 22:52   ` Kees Cook
2019-10-01 17:34     ` Romain Perier
2019-09-30 23:06 ` [PRE-REVIEW PATCH 00/16] Modernize the tasklet API Kees Cook
2019-10-01 17:47   ` Romain Perier
2019-10-10 22:34     ` Kees Cook
2019-10-30  8:20       ` Allen
2019-11-07  7:29         ` Romain Perier
2019-11-07 21:22           ` Kees Cook

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