Hello Sasikumar Chandrasekaran,
This is a semi-automatic email about new static checker warnings.
The patch 9581ebebbe35: "scsi: megaraid_sas: Add the Support for
SAS3.5 Generic Megaraid Controllers Capabilities" from Jan 10, 2017,
leads to the following Smatch complaint:
drivers/scsi/megaraid/megaraid_sas_base.c:5245 megasas_init_fw()
error: we previously assumed 'fusion' could be null (see line 5069)
drivers/scsi/megaraid/megaraid_sas_base.c
5068
5069 if (fusion)
^^^^^^
Patch introduces a new NULL check.
5070 instance->instancet = &megasas_instance_template_fusion;
5071 else {
5072 switch (instance->pdev->device) {
5073 case PCI_DEVICE_ID_LSI_SAS1078R:
5074 case PCI_DEVICE_ID_LSI_SAS1078DE:
5075 instance->instancet = &megasas_instance_template_ppc;
5076 break;
5077 case PCI_DEVICE_ID_LSI_SAS1078GEN2:
5078 case PCI_DEVICE_ID_LSI_SAS0079GEN2:
5079 instance->instancet = &megasas_instance_template_gen2;
5080 break;
5081 case PCI_DEVICE_ID_LSI_SAS0073SKINNY:
5082 case PCI_DEVICE_ID_LSI_SAS0071SKINNY:
5083 instance->instancet = &megasas_instance_template_skinny;
5084 break;
5085 case PCI_DEVICE_ID_LSI_SAS1064R:
5086 case PCI_DEVICE_ID_DELL_PERC5:
5087 default:
5088 instance->instancet = &megasas_instance_template_xscale;
5089 instance->pd_list_not_supported = 1;
5090 break;
5091 }
5092 }
5093
5094 if (megasas_transition_to_ready(instance, 0)) {
5095 atomic_set(&instance->fw_reset_no_pci_access, 1);
5096 instance->instancet->adp_reset
5097 (instance, instance->reg_set);
5098 atomic_set(&instance->fw_reset_no_pci_access, 0);
5099 dev_info(&instance->pdev->dev,
5100 "FW restarted successfully from %s!\n",
5101 __func__);
5102
5103 /*waitting for about 30 second before retry*/
5104 ssleep(30);
5105
5106 if (megasas_transition_to_ready(instance, 0))
5107 goto fail_ready_state;
5108 }
5109
5110 if (instance->is_ventura) {
5111 scratch_pad_3 =
5112 readl(&instance->reg_set->outbound_scratch_pad_3);
5113 #if VD_EXT_DEBUG
5114 dev_info(&instance->pdev->dev, "scratch_pad3 0x%x\n",
5115 scratch_pad_3);
5116 #endif
5117 instance->max_raid_mapsize = ((scratch_pad_3 >>
5118 MR_MAX_RAID_MAP_SIZE_OFFSET_SHIFT) &
5119 MR_MAX_RAID_MAP_SIZE_MASK);
5120 }
5121
5122 /* Check if MSI-X is supported while in ready state */
5123 msix_enable = (instance->instancet->read_fw_status_reg(reg_set) &
5124 0x4000000) >> 0x1a;
5125 if (msix_enable && !msix_disable) {
5126 int irq_flags = PCI_IRQ_MSIX;
5127
5128 scratch_pad_2 = readl
5129 (&instance->reg_set->outbound_scratch_pad_2);
5130 /* Check max MSI-X vectors */
5131 if (fusion) {
5132 if (fusion->adapter_type == THUNDERBOLT_SERIES) { /* Thunderbolt Series*/
5133 instance->msix_vectors = (scratch_pad_2
5134 & MR_MAX_REPLY_QUEUES_OFFSET) + 1;
5135 fw_msix_count = instance->msix_vectors;
5136 } else { /* Invader series supports more than 8 MSI-x vectors*/
5137 instance->msix_vectors = ((scratch_pad_2
5138 & MR_MAX_REPLY_QUEUES_EXT_OFFSET)
5139 >> MR_MAX_REPLY_QUEUES_EXT_OFFSET_SHIFT) + 1;
5140 if (instance->msix_vectors > 16)
5141 instance->msix_combined = true;
5142
5143 if (rdpq_enable)
5144 instance->is_rdpq = (scratch_pad_2 & MR_RDPQ_MODE_OFFSET) ?
5145 1 : 0;
5146 fw_msix_count = instance->msix_vectors;
5147 /* Save 1-15 reply post index address to local memory
5148 * Index 0 is already saved from reg offset
5149 * MPI2_REPLY_POST_HOST_INDEX_OFFSET
5150 */
5151 for (loop = 1; loop < MR_MAX_MSIX_REG_ARRAY; loop++) {
5152 instance->reply_post_host_index_addr[loop] =
5153 (u32 __iomem *)
5154 ((u8 __iomem *)instance->reg_set +
5155 MPI2_SUP_REPLY_POST_HOST_INDEX_OFFSET
5156 + (loop * 0x10));
5157 }
5158 }
5159 if (msix_vectors)
5160 instance->msix_vectors = min(msix_vectors,
5161 instance->msix_vectors);
5162 } else /* MFI adapters */
5163 instance->msix_vectors = 1;
5164 /* Don't bother allocating more MSI-X vectors than cpus */
5165 instance->msix_vectors = min(instance->msix_vectors,
5166 (unsigned int)num_online_cpus());
5167 if (smp_affinity_enable)
5168 irq_flags |= PCI_IRQ_AFFINITY;
5169 i = pci_alloc_irq_vectors(instance->pdev, 1,
5170 instance->msix_vectors, irq_flags);
5171 if (i > 0)
5172 instance->msix_vectors = i;
5173 else
5174 instance->msix_vectors = 0;
5175 }
5176 /*
5177 * MSI-X host index 0 is common for all adapter.
5178 * It is used for all MPT based Adapters.
5179 */
5180 if (instance->msix_combined) {
5181 instance->reply_post_host_index_addr[0] =
5182 (u32 *)((u8 *)instance->reg_set +
5183 MPI2_SUP_REPLY_POST_HOST_INDEX_OFFSET);
5184 } else {
5185 instance->reply_post_host_index_addr[0] =
5186 (u32 *)((u8 *)instance->reg_set +
5187 MPI2_REPLY_POST_HOST_INDEX_OFFSET);
5188 }
5189
5190 i = pci_alloc_irq_vectors(instance->pdev, 1, 1, PCI_IRQ_LEGACY);
5191 if (i < 0)
5192 goto fail_setup_irqs;
5193
5194 dev_info(&instance->pdev->dev,
5195 "firmware supports msix\t: (%d)", fw_msix_count);
5196 dev_info(&instance->pdev->dev,
5197 "current msix/online cpus\t: (%d/%d)\n",
5198 instance->msix_vectors, (unsigned int)num_online_cpus());
5199 dev_info(&instance->pdev->dev,
5200 "RDPQ mode\t: (%s)\n", instance->is_rdpq ? "enabled" : "disabled");
5201
5202 tasklet_init(&instance->isr_tasklet, instance->instancet->tasklet,
5203 (unsigned long)instance);
5204
5205 instance->ctrl_info = kzalloc(sizeof(struct megasas_ctrl_info),
5206 GFP_KERNEL);
5207 if (instance->ctrl_info == NULL)
5208 goto fail_init_adapter;
5209
5210 /*
5211 * Below are default value for legacy Firmware.
5212 * non-fusion based controllers
5213 */
5214 instance->fw_supported_vd_count = MAX_LOGICAL_DRIVES;
5215 instance->fw_supported_pd_count = MAX_PHYSICAL_DEVICES;
5216 /* Get operational params, sge flags, send init cmd to controller */
5217 if (instance->instancet->init_adapter(instance))
5218 goto fail_init_adapter;
5219
5220 if (instance->msix_vectors ?
5221 megasas_setup_irqs_msix(instance, 1) :
5222 megasas_setup_irqs_ioapic(instance))
5223 goto fail_init_adapter;
5224
5225 instance->instancet->enable_intr(instance);
5226
5227 dev_info(&instance->pdev->dev, "INIT adapter done\n");
5228
5229 megasas_setup_jbod_map(instance);
5230
5231 /** for passthrough
5232 * the following function will get the PD LIST.
5233 */
5234 memset(instance->pd_list, 0,
5235 (MEGASAS_MAX_PD * sizeof(struct megasas_pd_list)));
5236 if (megasas_get_pd_list(instance) < 0) {
5237 dev_err(&instance->pdev->dev, "failed to get PD list\n");
5238 goto fail_get_pd_list;
5239 }
5240
5241 memset(instance->ld_ids, 0xff, MEGASAS_MAX_LD_IDS);
5242
5243 /* stream detection initialization */
5244 if (instance->is_ventura) {
5245 fusion->stream_detect_by_ld =
5246 kzalloc(sizeof(struct LD_STREAM_DETECT *)
5247 * MAX_LOGICAL_DRIVES_EXT,
5248 GFP_KERNEL);
Ugh... What's with the indenting here? Normally, I spent some time
reviewing these static checker warnings before I email the reports but
it's hard to even look at this code. It makes me discouraged to look at
code this ugly.
Everyone hates newbies coming in and sending hundreds of style cleanups
but to me it means that basic style is pretty easy for everyone. Just
making the code look nice shows me that you at least care a little bit
instead of just pooping out code and merging it into upstream.
Someone emailed me this morning appologizing for introducing an ERR_PTR
dereference. I'm thinking, that's just a mistake. We all make mistakes
it's part of being human. But when I look at this code, I feel sad
because at least put some effort into it...
Anyway, I suspect that this is a false positive but it's too painful to
look at this code so I haven't checked.
5249 if (!fusion->stream_detect_by_ld) {
5250 dev_err(&instance->pdev->dev,
5251 "unable to allocate stream detection for pool of LDs\n");
5252 goto fail_get_ld_pd_list;
5253 }
5254 for (i = 0; i < MAX_LOGICAL_DRIVES_EXT; ++i) {
5255 fusion->stream_detect_by_ld[i] =
5256 kmalloc(sizeof(struct LD_STREAM_DETECT),
5257 GFP_KERNEL);
5258 if (!fusion->stream_detect_by_ld[i]) {
5259 dev_err(&instance->pdev->dev,
5260 "unable to allocate stream detect by LD\n ");
5261 for (j = 0; j < i; ++j)
5262 kfree(fusion->stream_detect_by_ld[j]);
5263 kfree(fusion->stream_detect_by_ld);
5264 fusion->stream_detect_by_ld = NULL;
5265 goto fail_get_ld_pd_list;
5266 }
5267 fusion->stream_detect_by_ld[i]->mru_bit_map
5268 = MR_STREAM_BITMAP;
5269 }
5270 }
regards,
dan carpenter
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